Brake for hoisting mechanisms.



, PATENTED NOV. 21, 1905. B. M. GOYNE. BRAKE FOR HOISTING MECHANISMS.

APPLICATION FILED 14113.17, 1905.

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PATENTED NOV. 21, 1905. E. M. GOYNB. v BRAKE FOR HOISTING MECHANISMS.

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APPLICATION FILED MAR. 17, 1905.

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INVENTOR (3 @K W i ATTORNEY UNITED STATES PATENT OFFICE.

EDMUND M. OOYNE, OF WEST SENECA, NEW YORK, ASSIGNOR OF ONE- HALF TOWILLIAM U. HEVERLY, OF BUFFALO, NEW YORK.

Specification of Letters Patent.

Patented Nov. 21, 1905.

Application filed March 17,1905. Serial No. 250,653.

To all whom, it may concern.

Be it known that I, EDMUND M. CoYNE, a citizen of the United States,residing in the town of est Seneca, in the county of Erie and State ofNew York, have invented certain new and useful Improvements in Brakesfor Hoisting Mechanisms, of which the following is a specification.

My invention relates to brakes for hoistingmachines; and it is primarilydesigned for use on electric traveling cranes, its purpose being tocheck the accidental descent of objects being raised and lowered withsuch cranes.

While particularly designed for use on electric traveling cranes, theadaptability of this brake is not limited to such machines, but may beused without departing from the principle involved or the combination ofelements and devices claimed hereinafter in all places where brakes areof use.

The mechanism or parts or devices employed provide for carrying down theload at the desired speed and with an even movement, the resistancecaused by the braking action being regulated to a nicety and themechanism employed being capable of varying the braking power inproportion to the load, so that positive action is provided at all timesand full control obtained irrespective of the load or conditions underwhich the hoisting apparatus may be used.

My invention in addition to possessing the above-stated advantage hasfor its object to provide asimple, durable, and powerful brake in whichthe number of parts employed is reduced to a minimum, to provide acompact and reliable brake that can be applied to any style ofhoisting-machine, and to otherwise improve on brakes now in use.

To these ends my invention consists in the construction, arrangement,and combination of parts and devices to be hereinafter described, andparticularly pointed out in the appended claims.

In the accompanying drawings, Figure 1 is avertical longitudinal sectionof the brake and the supporting-frame therefor, the several parts beingrelatively positioned to elevate a load. Fig. 2 is a similar view withthe parts arranged to lower a load of light Weight, the position of theparts being the extreme opposite to the position of the same shown inFig. 1. Fig. 3 is atransverse vertical section taken tical section takenon line 1 y, Fig. 3.

on line a: 00, Fig. 1. Fig. i is an enlarged ver- Fig. 5 is an enlargedvertical section taken on line 2 .2, Fig. 1, the driving-gear beingshown in elevation. Fig. 6 is an enlarged detached perspective view ofthe brake shifting gearsleeve. Fig. 7 is an enlarged detachedperspective view of the clutch-disk.

Referring to the drawings in detail, corresponding numerals of referencedesignate corresponding parts in the several figures.

The reference-numeral 1 designates the supporting-frame, which may be ofany construction and forming part of the hoisting-machine or independentof the latter, as may be desired. For illustration purposes merely Ihave shown a frame comprising longitudinal beams 2, upper and lowercross-beams 3, corner-uprights 4, and intermediate journal-beams 5between the upper and lower cross-beams. Journaled in the frame, hereinshown as in the journal-beams 5, is a longitudinally-disposed shaft 6,having stop-collars 7 to prevent endwise movement, said shaft beingenlarged in diameter at 8 and having said enlarged portion provided witha double screw-thread 9, onto which is screwed for lengthwise movementon the shaft an internally-donble-threaded gear-sleeve 10, whose outerface is provided with longitudinally-disposed teeth ll, and whose innerend is flanged, as at 12. Suitably journaled in a bracket 13, carried bythe frame, is a shaft 14:, arranged parallel with the shaft 6 andhavingagear 15 held in mesh with the gear-sleeve 10, the latter beingcapable of moving length-wise on the shaft 6, while maintaining meshingrelation with the gear 15. The gear 15 is revolved by any suitablemeans, the driving device ordinarily employed being an electric motor.

Secured to the enlarged portion 8 of the shaft 6 by means of a key 16 isa clutch-disk 17, having a series of peripheral notches 18 extendingthrough one-half its width, each notch having a curved wall 19 and aninclined wall 20. In each of the inclined walls 20 a socket 21 isformed, into which one end of a spiral spring 22 is seated. Pivotallysecured in each of the peripheral notches 18 is a pawl 23, having itsfree end projecting outside the periphery of the clutch-disk. The freeend of the spiral springs 22 bear against the inner faces of said pawlsand hold the same in their projeeted position. The opposed faces of thegear-sleeve 10 and the clutch-disk 17 are pro vided with coactingoppositely-inclined lockteeth 24 25, respectively. Said lock-teeth arearranged in pairs and are engaged when elevating a load.

26 designates a brake-w heel mounted loosely on the shaft 6 and having acentral depression 27, into which (its the clutch-disk. The latter isthus surrounded by acircumferential wall 28, which is reduced inthicknessv at its outer end to receive an internally-toothed annulus 29,secured to said brake-wheel by rivets or bolts 30. Said annulus ispreferably made in two pieces of hardened steel, and the teeth thereonare adapted to be engaged by the free ends of the pawls 23. Manifestly,the surrounding wall may be made of even thickness throughout and theteeth formed directly on the inner periphery thereof. The separateannulus, however, is preferable, as it can be quickly replaced whenworn. Said brakewheel is held between the clutch-disk and a collar 31and cannot, therefore, move lengthwise on the shaft. The pivotal pointsof the pawls 23 are arranged equidistant around the clutch-disk and alike distance from the axis of said disk, and it is provided that onehalf the number of said pawls shall be shorter than the other half, thedifference in length to be equal to one-half the length of the teeth onthe annulus 29, so that in the event of the load accidentally loweringfrom any cause whatsoever one-half of the series of pawls will engagesaid annulus and check the descent of the load, the extent of drop beingthus reduced to a minimum and but slight jar produced.

By this arrangement the necessary depth and strength may be given theteeth while obtaining the advantage of checking the descent in one-halfthe distance allowed by the length of a tooth. A gear-wheel 32 issecured to the shaft and may by any suitable means be connected with thehoisting mechanism.

Lying on opposite sides of the brake-wheel are brake-shoes 33, eachcomprising a wooden friction-shoe 34 and a metallic frame 35, having apair of lugs 36, between which brakelevers 37 are pivotally secured. Oneend of each brake-lever is fulcrnmed on a bolt 38, adjustable in across-beam 39 on .the frame, the adjustment being effected by nuts 40 onopposite sides of said beams. The opposite ends of said brake-levers arepivotally secured to inclined links 41, having their inner endspivotally secured to a collar 42, slidable on the shaft 6 and governedin its movements along the shaft by the gearssleeve 10. Said slidablecollar is limited in its outward movement by a stop-collar 43. Thebrake-shoes are held against the brake-w heel by initial springpressure.To accomplish this, I provide cross-beams 44, which are provided withpockets 45, in which followers 46 are held and adjusted therein by bolts47. Between said. followers and the brake-shoes spiral pressuresprings48 are located, which may be placed under the desired tension bymanipulating the adjusting-bolts 47. In this manner the brake-shoes maybe held against the brakewheel with the desired initial pressure, to beaugmented by the brake-levers when desired. In releasing the brake-shoesby theaction of the brake-levers it may be necessary in light loads toovercome a portion of the springpressure, while in lowering heavy loadsthe pressure from the brake-levers cannot be entirely removed. This ofcourse depends considerably on the tension under which the springs areplaced.

WVhen elevating the load, the gear-sleeveisin engagement with theclutch-disk, which is secured to the shaft, the latter, theclutch-sleeve, and the gear-sleeve being revolved in the direction ofthe arrow A. During such movement the pawls 23 ride over the successiveteeth on the brake-wheel, and in the event of the load descendingaccidentally the pawls en gage said teeth and by reason of thebrakewheel being held firmly against movement check the descent of theload without jar and without subjecting the parts to sudden and violentstrain. When the load is elevated, the hoisting mechanism holds thesame, as do also the pawls 23, which engage the teeth of thebrake-wheel. On lowering the load movement is imparted to thegear-sleeve in an opposite direction by the gear 15, thereby disengagingsaid sleeve from the clutch-disk and forcing the slidable collar 42outward, which causes the brake-levers to be moved outward by the actionof the intervening links, thus releasing the pressure of the brake-shoesfrom the brake-wheel and allowing the latter, the clutch-disk engagedtherewith, the shaft, and the gear-sleeve to revolve in the direction ofthe arrow, (designated B.)

This invention is susceptible to many changes in form, construction, andrelatix e disposition and location of parts. The invention is not,therefore, to be confined to the specific construction herein described,as the description merely particularizes the preferred embodimentthereof.

Having thus described my invention, what I claim is 1. In a brakemechanism, the combination of a shaft, a brake-wheel loosely mounted onthe shaft, a clutch device secured to the shaft and adapted forengagement with the brakewheel, a brake-shoe in contact with saidbrakewheel, and a brake-lever pivotally connected between its ends tothe brake-shoe and having one end fulcrumed and its other end arrangedto be actuated.

2. In a brake mechanism, the combination of a shaft, a clutch-disksecured to said shaft and having pawls pivotally held thereon with theirpivotal point arranged equidistant IIO around said disk, said pawlsbeing of different lengths, a brake-wheel surrounding said clutch-diskand having an annular series of teeth with which said pawls are engaged,and a brake device acting against said brakewheel.

3. In a brake mechanism, the combination of a shaft, a brake-wheelloosely mounted on said shaft, a clutch device revoluble with the shaftand adapted for engagementwith the brake-wheel, brake-shoes on oppositesides of and acting against said brake-wheel, and brake-levers fulcrumedat one of their ends and having pivotal connections between their endswith said brake-shoes, and means engaging the opposite ends of saidlevers for actuating the same.

4:. In a brake mechanism, the combination of a shaft having a portionthereof screwthreaded, an internally-threaded sleeve fitting thethreaded portion of said shaft, a slidable collar on the shaft actuatedin one direction by said sleeve, means for revolving said sleeve on theshaft in either direction, a clutch device on the shaft comprising afixed member and a loosely-mounted mem ber,means to cause saidinternally-threaded sleeve to revolve with the fixed member of theclutch device, and a brake device operatively connected with saidslidable collar.

5. In a brake mechanism, the combination with a suitable frame, of ashaft revoluble in said frame, a clutch device on said shaft comprisinga fixed member and a loosely-mounted member, brake-shoes lying onopposite sides of said clutch device and acting against the looselymounted member thereof, brake levers fulcrumed to said frame and havingtheir fulcrum-points adjustable, said brake-levers being pivotallyconnected between their ends to said brake-shoes, and means foractuating said brake-levers.

6. In a brake mechanism, the combination with a suitable frame, of ashaft revoluble in said frame, a clutch device on said shaft comprisinga fixed member and a loosely-mounted member, a brake shoe acting againstthe loosely mounted member of said clutch, a brake-lever pivotallyconnected to said brakeshoe, a bolt adjustable in the frame and havingthe brake-lever fulcrumed thereon, and means for actuating said lever.

7. In a brake mechanism, the combination with a suitable frame, of ashaft revolubly mounted in said frame, a clutch device on said shaftcomprising afixed member and a looselymounted member, a brake-shoeacting against said loosely-mounted member comprising a solid removablebody and a frame carrying said removable body, springs acting againstsaid brake-shoe, means for adjusting the pressure of said springs, and abrake-lever connected to said brake-shoe.

8. In a brake mechanism, the combination of a shaft having a portionthereof threaded,

a clutch-disk secured to said shaft adjacent the threaded portionthereof and having inclined lock-teeth on the face thereof, abrake-wheel loosely mounted on the shaft and adapted to be engaged bysaid clutch-disk, an internallythreaded gear-sleeve engaging thethreaded portion of the shaft and having inclined lockteeth adapted toengage the teeth on said clutch-disk, a brake-shoe acting against saidbrake-wheel, a brake device, operative con-- nection between saidgear-sleeve and the brake device, and means for revolving the gearsleeveon the shaft in either direction.

9. In a brake mechanism, the combination with a suitable frame, of ashaft revolubly mounted in said frame, a brake-wheel loosely mounted onsaid shaft and having an annular.

flange provided with an annular row of teeth on its inner surface, aclutch-disk secured to the shaft and having pawls adapted for engagementwith said teeth, means for revolving said shaft embodying a gear-sleeveslidable on the latter and adapted for engagement with said clutch-diskto revolve the same on movement of said sleeve in one direction, andbraking means connected with said gearsleeve and adapted to act againstsaid brakewheel.

10. In a brake mechanism, the combination with a suitable frame, of'ashaft mounted in said frame, a brake-wheel loosely mounted on saidshaft, clutching means for causing said brake-wheel to revolve with theshaft, a braking device acting against the brake-wheel, and means foractuating said braking device and for engagement with said clutchingmeans.

11. In a brake mechanism, the combination with a suitable frame, of ashaft mounted in said frame, a clutch disk secured to said shaft andhaving pawls of different lengths secured thereto, a brake-wheel havingan in ternally toothed flange surrounding said clutch-disk with whichsaid pawls are adapted to engage on movement of the clutch-disk in onedirection and over which said pawls ride on movement of said disk in theopposite direction, brake-shoes for said brake-wheel, and drivingmechanism embodying a sleeve movable lengthwise and revolnble on theshaft and having locking means to engage the clutchdisk on beingrevolved in one direction, and means for causing said brake shoes to bemoved from the brake-wheel on movement of said sleeve in the oppositedirection.

12. In a brake mechanism, the combination with a suitable frame, of ashaft mounted in said frame and having a screw-thread thereon,aclutch-disk secured to said shaft, a brakewheel loosely mounted on saidshaft and adapted to be engaged by said clutch-disk, aninternally-threaded gear-sleeve on thethreaded portion of said shaftadapted for movement lengthwise of the shaft on being revolved, meansfor locking said gear-sleeve to the clutch-disk when revolved in onedirection, a slidable col lar on said shaft movable lengthwise with saidgear-sleeve, brake-shoes, and mechanism between said brakershoes andsaidslidable collar.

13. In a brake mechanism, the combination with a suitable frame, of ashaft mounted in brake-levers with the slidable collar on the shaft.

1 1. In a brake mechanism, the combination with a suitable frame, of ashaft mounted in said frame, a brake-wheel loosely mounted on saidshaft, a clutch device to cause said brakewheel to revolve with saidshaft, brake-shoes for said brake-wheel, brake-levers connected to saidbrake-shoes, and pressure-springs hearing against said brake-shoes.

15. In a brake mechanism, the combination with a suitable frame, of ashaft mounted in said. frame, a brake-wheel loosely'mounted on saidshaft, a clutch device to cause said brakewheel to revolve with saidshaft, brake-shoes for said brake-wheel, brake-levers connected to saidbrake-shoes, pressure-springs bearing against said brake-shoes, andmeans for increasing or diminishing the pressure of said springs.

16. In a brake mechanism, the combination with a suitable frame, of ashaft mounted in said frame, a brake-wheel loosely mounted on saidshaft, a clutch device to cause said brake- Wheel to revolve with saidshaft, a brake-shoe for said brake-wheel comprising a friction bodyportion and a frame in which said body portion is held, and abrake-lever attached to the frame of said brake-shoe.

In testimony whereof I have affixed my signature in the presence of twosubscribing witnesses.

EDMUND M. COYNE.

. Witnesses:

JULIUS LANKER, EMIL N EUHART.

